function CSSManager()
{

if (  navigator.appVersion.lastIndexOf('Win') != -1)
	{
		// windows
		//document.styleSheets[ 0].disabled = false;
		document.styleSheets[ 1].disabled = true;
		document.styleSheets[ 2].disabled = true;
		return;
	}
	else
	{
		if ( ( window.navigator.userAgent.lastIndexOf('MSIE 5')  != -1)  ||  ( window.navigator.userAgent.lastIndexOf('Mozilla/5') !=-1) )
		{
			// macintosh and IE 5 or Navigator 5 or up
			document.styleSheets[ 0].disabled = true;
			//document.styleSheets[ 1].disabled = false;
			document.styleSheets[ 2].disabled = true;			
			
			return;
		}
		else
		{
			// macintosh and IE < 5
			document.styleSheets[ 0].disabled = true;
			document.styleSheets[ 1].disabled = true;
		}	
	}
}

function goBack()
{
	if (history.length > 0)
	{
		history.back();
	}
	else
	{
		alert("Questa è la prima pagina");
	}
}

function updateImage( imagename )
{
	//window.location.reload( force );
	// alert ( "imagename " + imagename );
	obj = document.all.item (imagename);
	// alert ( "obj " + obj );
	source = obj.src;
	//alert ( "source " + source );
	obj.src = "";
	obj.src = source;
	// alert ( "location refreshed");
}